What is Layer?

Layer definition and meaning on Dictionary terms:
a thickness of some material laid on or spread over a surface: a layer of soot on the window sill; two layers of paint.
bed; stratum: alternating layers of basalt and sandstone.

a person or thing that lays: a carpet layer.
a hen kept for egg production.
one of several items of clothing worn one on top of the other.
Horticulture. a shoot or twig that is induced to root while still attached to the living stock, as by bending and covering with soil.a plant so propagated.

Ropemaking. a machine for laying rope or cable.

verb (used with object)
to make a layer of.
to form or arrange in layers.

to arrange or wear (clothing) in layers: You can layer this vest over a blouse or sweater.
Horticulture. to propagate by layering.

verb (used without object)
to separate into or form layers.
(of a garment) to permit of wearing in layers; be used in layering: Frilly blouses don’t layer well.